public class BoKeTest {
    public static void main(String[] args) {
     int score = 0;
        if(score>=90){
            System.out.println("优秀");
        }
        else if (score>=80 && score <= 90){
            System.out.println("良好");
        }
        else if (score>=70 && score <= 80){
            System.out.println("中等");
        }
        else if (score>=60 && score <= 70){
            System.out.println("及格");
        }
        else if (score<60){
            System.out.println("不及格");
        }
        else{
            System.out.println("错误输入");
        }
    }
}
